Welcome to PHSC 2014: General Physics 1

PHSC 2015: Calc-Based Physics 1

Subject Matter

The secrets of the Universe

What’s the Point?

• Physics is basic

• Physics is the secrets of the universe

• Physics is problem-solving

Subjects

• Mechanics– forces and responses– interactions and collisions– repositioning and rotating– uniform and accelerated rotation– gravity– conservation laws

Subjects

• Fluids– pressure– buoyancy– flow

• Oscillations– simple harmonic oscillators– damped and driven oscillators

Subjects

• Waves– limiting types: longitudinal and transverse– factors determining speed– interference: standing waves and beats– Doppler effect

• Heat and Temperature– arrow of time– engines

Who are You?

• Please clearly write your first and last name on the tent card

• Please bring your tent card to every class

Your Name

First Last

Group Work

Introduce yourself to your group.

Identify something memorable about• yourself• your home town• your family• your name• or anything else associated with you

Tell your group and write it down.

Mechanics of the Course

PHSC 2015: Calculus-Based

• We need to find another hour to meet each week

• Any suggestions?

Standards-based grading

• Scored on standards, not points

• The more standards you meet, the higher your final grade

Meeting the Standards

• Last assessment matters

• Don’t blow off early assessments: learn!

• If lots of folks miss a standard, I’ll re-quiz

• If you personally miss a standard:– Work some more problems– See me for a re-assessment

• I want you to succeed.

Quizzes

• In class• May be announced or unannounced• Assess on standards (no numeric score)

Scores on Standards

N Not assessed

I Not eligible for reassessment

E Eligible for reassessment

P Progressing

S Satisfactory

• S is the only score satisfying a standard

• Other scores tell what needs to happen

X

Labs

• Tuesdays 10–noon, 1–3, 3–5

• Room HSC 111 (downstairs)

• First labs tomorrow

• Manual on-line for now

• Must meet lab standards for grade

Homework

• No points: for practice

• Required for retaking standards

• Additional exercises may also be required for retakes

Textbook and Lab Manual• Textbook: Walker, Physics, 4th ed. (req.)

• Lab Book: Physics I Laboratory Manual (pending)

How to Succeed

Read the Textbook

• Read before class

• Study after

Prepare for Lab

• Read manual before lab

• Do pre-lab (due at start of lab)

Do the Homework

• Possibly online exercises

• Turn in written part in class

• Late submissions don’t get feedback

Use Web Resources

• Class web site – www.barransclass.com/phsc2014– Syllabus, standards, PowerPoints

• Balckboard– Scores (I hope I can do standards there)

Visit Me

Heimerman Science center room 119

Hours: MWF 1–2 PMT 9–10 AM

or by appointment

or come in if my door is open

The Science of Physics

the fundamental quantities

Quantities and Units

Distance meter (m)

Mass kilogram (kg)

Time second (s)

Charge coulomb (C)

SI (International System) or MKS units

Quantity Unit

Working with Units

Math makes sense

Eat a live bullfrog first thing in the morning…

…and nothing worse will happen to you for the rest of the day!

Do math with units

• Unit labels can be treated like any variable in algebra.

Add them!

3 x + 4 x = 7 x

3 s + 4 s = 7 s

Multiply them!

(3a)(4b) = 12 ab

(3 m/s)(4 s) = 12 m

= 3 x/y 6 x2 y

= 3 J/s 6 J2 s

Divide them!

Compound Units

• Areas• Volumes• Accumulated effects• Effects of population

Represent:

Compound Units

a

b

Area = ab

Compound Units

3workers

Effort= (3 w) (4 h)

= 12 (w)(h)

= 12 worker·hours

4 h

Ratio Units

• Rates of change• Intrinsic properties

Represent:

Ratio Units

A baby has a mass of 3.2 kg at birth and 8.6 kg 9 months later. What is its average annual growth rate during this time?

slope =5.4 kg

0.75 y= 7.2 kg/y

mass (kg)

time (y)

10

8

6

4

2

0

0 1

0.75 y

5.4 kg

Manipulating Units

• Conversions

39.37 in = 1 m

72 in

equality

conversion factors

= 72 in · 1

=39.37 in

1 m1 =

1 m1

39.37 in

= 72 in ·1 m

39.37 in=

72

39.37m = 1.829 m

Group Work

2. 1 mi = 5280 ft1 yd = 3 ft Set up the conversion 2 mi to yd.

3. 1 mi = 5280 ft1 ft = 12 in1 m = 39.37 in1 h = 3600 sSet up the conversion 75 mi/h to m/s.

Reading for Next Time

• Distance, velocity, and acceleration: how physics describes motion

• Keep in mind the relations between different quantities

Right away

• Go to your lab session this week.

• Go to your discussion session this week.

• Get a Moodle account.

• Join this course on Moodle.

• Complete the assigned reading.